Supramolecular click procedures in liquid crystals

Lehmann, Matthias; Dechant, Moritz; Gerbig, Lisa; Baumann, Maximilian

doi:10.1080/02678292.2019.1618936

Cited by 13 publications

(9 citation statements)

References 27 publications

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“…The phase transition was measured using the (MS) technique, and the results obtained were consistent with those measured by (DSC) and (POM) methods. Birefringence (∆n) was calculated from the light transmittance of the sample in the LC phase as follows [22,23,[34][35][36]:…”

Section: Measuring Birefringence By Using Modified Spectrophotometermentioning

confidence: 99%

“…The factors of the birefringence, of thermal stability and order parameter were also reported [19,20]. Recently, supramolecular liquid crystals (SMLCs) intensively attracted the attention of many scientific research studies [21][22][23][24][25][26][27][28][29][30][31]. Among the self-assembly method LCs is H-bonding intermolecular interactions with noncovalent bonds [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Optical and Geometrical Characterizations of Non-Linear Supramolecular Liquid Crystal Complexes

et al. 2020

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Nonlinear architecture liquid crystalline materials of supramolecular 1:1 H-bonded complexes (I/II and I/III) were prepared through a self-assembly intermolecular interaction between azopyridine (I) and 4-n-alkoxybenzoic acid (II) as well as 4-n-alkoxyphenylazo benzoic acid (III). The H-bond formation of the prepared supramolecular hydrogen bonded (SMHB) complexes was confirmed by Fourier-transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). Optical and mesomorphic behaviors of the prepared complexes were studied by polarized optical microscopy (POM) as well as DSC. Theoretical calculations were performed by the density functional theory (DFT) and used to predict the molecular geometries of the synthesized complexes, and the results were used to explain the experimental mesomorphic and optical properties in terms of their estimated thermal parameters. Ordinary and extraordinary refractive indices as well as birefringence at different temperatures were investigated for each sample using an Abbe refractometer and modified spectrophotometer techniques. Microscopic and macroscopic order parameters were calculated for individual compounds and their supramolecular complexes.

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Section: Measuring Birefringence By Using Modified Spectrophotometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical and Geometrical Characterizations of Non-Linear Supramolecular Liquid Crystal Complexes

et al. 2020

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“…Recently, supramolecular liquid crystals (SMLCs) attracted a vivid attention of the scientific community [1][2][3][4][5]. These systems combine the supramolecular chemistry [6] and liquid crystals [7,8] with efficient properties for optical and technological potential applications [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Approaches of New Nematogenic Chair Architectures of Supramolecular H-Bonded Liquid Crystals

Alhaddad

Hagar

2020

Molecules

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New four isomeric chair architectures of 1:1 H-bonded supramolecular complexes were prepared through intermolecular interactions between 4-(2-(pyridin-4-yl)diazenyl-(2-(or 3-)chlorophenyl) 4-alkoxybenzoates and 4-n-alkoxybenzoic acids. The H-bond formation of all complexes was confirmed by differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FTIR). Mesomorphic characterization was carried by DSC and polarized optical microscopy (POM). It was found that all prepared laterally chloro-substituted supramolecular complexes were nematogenic, and exhibited nematic phase and low melting temperature. The thermal stability of the nematic mesophase observed depends upon the location and spatial orientation of the lateral Cl− atom in as well as the length of terminal chains. Theoretical calculations were carried out within the paradigm of the density functional theory (DFT) in order to establish the molecular conformation for the formed complexes and estimate their thermal parameters. The results of the computational calculations revealed that the H-bonded complexes were in a chair form molecular geometry. Additionally, out of the acquired data, it was possible to designate the influence of the position and orientation of the lateral group as well as the alkoxy chain length on the stability of the nematic phase.

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“…Those changes in the characteristics of the LCs may impact the mesomorphic behaviour as well as the essential properties for technical uses. Recently, molecular interactions due to hydrogen bonding (H-bonding) formation have received more attention in the field of liquid crystal [26][27][28][29][30]. Supramolecular H-bonding LCs (SMHBLCs) designed through noncovalent interactions of suitable H-bond donors and acceptors are concerns of our area of interest [31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Chair- and V-Shaped of H-bonded Supramolecular Complexes of Azophenyl Nicotinate Derivatives; Mesomorphic and DFT Molecular Geometry Aspects

et al. 2020

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New geometrical architectures of chair- and V-shaped supramolecular liquid crystalline complexes were molded through 1:1 intermolecular hydrogen bonding interactions between 4-(4-(hexyloxy)phenylazo)methyl)phenyl nicotinate and 4-alkoxybenzoic acids. The length of terminal alkoxy acid chains varied, n = 6 to 16 carbons. The mesomorphic behaviour of these complexes was examined through differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fourier-transform infrared spectroscopy (FT-IR) was carried out to confirm the presence of Fermi bands that appeared for the hydrogen bonding formation. Enantiotropic nematic phases were observed and covered all lengths of alkoxy chains. The geometrical structures of the prepared supramolecular complexes geometries were estimated by Density functional theory (DFT) calculations. The supramolecular complexes I/An are projected to exhibit a nonlinear geometry with V-shaped and chair-shaped geometry. The chair-shaped conformers of I/An were found to be more stable than V-shaped isomeric complexes. Moreover, the effect of the change of the mesogenic core on the mesophase thermal stability (TC) has been investigated by a comparative study of the present azo supramolecular H-bonding LCs (SMHBCs) I/An and our previously reported their Schiff base analogue complexes, II/An. The findings of the DFT illustrated the high impact of CH=N as a mesogenic core on the mesomorphic behavior in terms of the competitive lateral and terminal intermolecular interactions as well as the molecular electrostatic potential (MEP).

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Supramolecular click procedures in liquid crystals

Cited by 13 publications

References 27 publications

Optical and Geometrical Characterizations of Non-Linear Supramolecular Liquid Crystal Complexes

Optical and Geometrical Characterizations of Non-Linear Supramolecular Liquid Crystal Complexes

Experimental and Theoretical Approaches of New Nematogenic Chair Architectures of Supramolecular H-Bonded Liquid Crystals

Chair- and V-Shaped of H-bonded Supramolecular Complexes of Azophenyl Nicotinate Derivatives; Mesomorphic and DFT Molecular Geometry Aspects

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